A novel chromo-and fluorogenic dual responding H2PO_4~-receptor based on an azo derivative

摘要

A simple,novel anion receptor based on 4-hydroxy-3-(N-phenyl-thiourea-N'-nitrilo-methylidynyl)-azobenzene with hybrid-OH and thiourea binding sites was synthesized and characterized.Anion binding character was determined using visual inspection,UV-vis,fluorescence and ~1H NMR analyses.The addition of F~-,AcO~-and H2PO_4~-resulted in a marked red shift of the charge-transfer absorbance band(DELTA lambda=140 nm,from 340 nm to 480 nm)accompanied by a color change from light yellow to orange.